INFORMATION PROCESSING APPARATUS, INFORMATION PROCESSING SYSTEM, AND INFORMATION PROCESSING METHOD

A first image pickup means picks up an image of a real space, to thereby obtain a first background image.A first positional relationship estimating unit estimates, in a case where the first background image includes a first marker image being an image of a marker previously registered and located in the real space, a first positional relationship being a spatial positional relationship of the first image pickup means to the marker based on the first marker image, and estimates, in a case where the first background image fails to include the first marker image, the first positional relationship based on a displacement of a feature point extracted from the first background image.An image generating unit generates a first additional image based on the first positional relationship, and synthesizes the first additional image and the first background image, to thereby generate a synthetic image.